Don't assume that rustup is installed

[aljazerzen]

When running flutter run -v I get the following output:

[   +3 ms] SEVERE: ================================================================================
[        ] SEVERE: Cargokit BuildTool failed with error:
[        ] SEVERE: --------------------------------------------------------------------------------
[        ] SEVERE:
[        ] SEVERE: rustup not found in PATH.
[        ] SEVERE:
[        ] SEVERE: Maybe you need to install Rust? It only takes a minute:
[        ] SEVERE:
[        ] SEVERE: $ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
[        ] SEVERE:
[        ] SEVERE: 

... which I assume is the culprit of [+7091 ms] Error: Build process failed shown later.

This error makes sense, because I don't have rustup installed on my system, since rust toolchain is supplied by the nix dev shell.

I suggest that before invoking rustup, Cargokit checks if a suitable version of rustc is already installed.

[temeddix]

Hi, thank you for the report :)

PRs for Cargokit should be made at its repository:

• https://github.com/irondash/cargokit

If the upstream is fixed, I'll be able to publish a new Rinf version right away.

[aljazerzen]

I see, thanks for quick reply

[aljazerzen]

Ref irondash/cargokit#100